Hadith Q102

وَالدَّلِيلُ عَلَى أَنَّ خَرَاطِيمَ مَا يَأْكُلُ الْمَيْتَةَ مِنَ السِّبَاعِ، وَمِمَّا لَا يَجُوزُ أَكْلُ لَحْمِهِ مِنَ الدَّوَابِّ وَالطُّيُورِ إِذَا مَاسَّ الْمَاءَ الَّذِي دُونَ الْقُلَّتَيْنِ وَلَا نَجَاسَةَ مَرْئِيَّةٌ بِخَرَاطِيمِهَا وَمَنَاخِيرِهَا إِنَّ ذَلِكَ لَا يُنَجِّسُ الْمَاءَ، إِذِ الْعِلْمُ مُحِيطٌ أَنَّ الْهِرَّةَ تَأْكُلُ الْفَأْرَ، وَقَدْ أَبَاحَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ الْوُضُوءَ بِفَضْلِ سُؤْرِهَا، فَدَلَّتْ سُنَّتُهُ عَلَى أَنَّ خُرْطُومَ مَا يَأْكُلُ الْمَيْتَةَ إِذَا مَاسَّ الْمَاءَ الَّذِي دُونَ الْقُلَّتَيْنِ لَمْ يَنْجُسْ ذَلِكَ خَلَا الْكَلْبِ الَّذِي قَدْ حَضَّ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ بِالْأَمْرِ بِغَسْلِ الْإِنَاءِ مِنْ وُلُوغِهِ سَبْعًا، وَخَلَا الْخِنْزِيرِ الَّذِي هُوَ أَنْجَسُ مِنَ الْكَلْبِ أَوْ مِثْلُهُ
And the explanation of the evidence that the trunks of predatory animals that eat carrion, and those cattle and birds whose meat is forbidden to eat, when they touch (drink from) water that is less than two pots, and if no impurity is seen on their trunks and beaks, then the water does not become impure. Because it is established that the cat eats mice, yet the Prophet (peace be upon him) permitted performing ablution with water left over by it. Therefore, the Sunnah of the Prophet (peace be upon him) is evidence that when the trunks of animals that eat carrion touch water less than two pots, that water does not become impure, except for the dog, for which the Prophet (peace be upon him) ordered the vessel to be washed seven times if it puts its mouth in it, and except for the pig, which is even more impure or similar to the dog.
Hadith Reference صحيح ابن خزيمه / جماع أبواب ذكر الماء الذي لا ينجس، والذي ينجس إذا خالطته نجاسة / Q102